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ESP 12F ESP 12E Serial WiFi Adapter Module 5V ESP8266 12F PTFE Free Design Eliminates Teflon PTFE Free Design Eliminates Teflon off gassing at high temperatures The optical heart rate sensor achieves 95 98% accuracy correlation with clinical grade ECG monitors during steady state cardio activities ESP 12F ESP 12E Serial WiFi Adapter Module 5V
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